| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.tools.jaotc.binformat.elf; |
| |
| import java.io.IOException; |
| import java.nio.charset.StandardCharsets; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| |
| import jdk.tools.jaotc.binformat.BinaryContainer; |
| import jdk.tools.jaotc.binformat.ByteContainer; |
| import jdk.tools.jaotc.binformat.CodeContainer; |
| import jdk.tools.jaotc.binformat.ReadOnlyDataContainer; |
| import jdk.tools.jaotc.binformat.Relocation; |
| import jdk.tools.jaotc.binformat.Relocation.RelocType; |
| import jdk.tools.jaotc.binformat.Symbol; |
| import jdk.tools.jaotc.binformat.Symbol.Binding; |
| import jdk.tools.jaotc.binformat.Symbol.Kind; |
| |
| import jdk.tools.jaotc.binformat.elf.ElfSymbol; |
| import jdk.tools.jaotc.binformat.elf.ElfTargetInfo; |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Ehdr; |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Shdr; |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Sym; |
| import jdk.tools.jaotc.binformat.elf.Elf.Elf64_Rela; |
| |
| |
| public class AMD64JELFRelocObject extends JELFRelocObject { |
| |
| AMD64JELFRelocObject(BinaryContainer binContainer, String outputFileName) { |
| super(binContainer, outputFileName); |
| } |
| |
| protected void createRelocation(Symbol symbol, Relocation reloc, ElfRelocTable elfRelocTable) { |
| RelocType relocType = reloc.getType(); |
| |
| int elfRelocType = getELFRelocationType(relocType); |
| ElfSymbol sym = (ElfSymbol) symbol.getNativeSymbol(); |
| int symno = sym.getIndex(); |
| int sectindex = reloc.getSection().getSectionId(); |
| int offset = reloc.getOffset(); |
| int addend = 0; |
| |
| switch (relocType) { |
| case JAVA_CALL_DIRECT: |
| case STUB_CALL_DIRECT: |
| case FOREIGN_CALL_INDIRECT_GOT: { |
| // Create relocation entry |
| addend = -4; // Size in bytes of the patch location |
| // Relocation should be applied at the location after call operand |
| offset = offset + reloc.getSize() + addend; |
| break; |
| } |
| case JAVA_CALL_INDIRECT: |
| case METASPACE_GOT_REFERENCE: |
| case EXTERNAL_PLT_TO_GOT: { |
| addend = -4; // Size of 32-bit address of the GOT |
| /* |
| * Relocation should be applied before the test instruction to the move instruction. |
| * reloc.getOffset() points to the test instruction after the instruction that loads the address of |
| * polling page. So set the offset appropriately. |
| */ |
| offset = offset + addend; |
| break; |
| } |
| case EXTERNAL_GOT_TO_PLT: { |
| // this is load time relocations |
| break; |
| } |
| default: |
| throw new InternalError("Unhandled relocation type: " + relocType); |
| } |
| elfRelocTable.createRelocationEntry(sectindex, offset, symno, elfRelocType, addend); |
| } |
| |
| private int getELFRelocationType(RelocType relocType) { |
| int elfRelocType = 0; // R_<ARCH>_NONE if #define'd to 0 for all values of ARCH |
| switch (ElfTargetInfo.getElfArch()) { |
| case Elf64_Ehdr.EM_X86_64: |
| // Return R_X86_64_* entries based on relocType |
| if (relocType == RelocType.JAVA_CALL_DIRECT || |
| relocType == RelocType.FOREIGN_CALL_INDIRECT_GOT) { |
| elfRelocType = Elf64_Rela.R_X86_64_PLT32; |
| } else if (relocType == RelocType.STUB_CALL_DIRECT) { |
| elfRelocType = Elf64_Rela.R_X86_64_PC32; |
| } else if (relocType == RelocType.JAVA_CALL_INDIRECT) { |
| elfRelocType = Elf64_Rela.R_X86_64_NONE; |
| } else if (relocType == RelocType.METASPACE_GOT_REFERENCE || |
| relocType == RelocType.EXTERNAL_PLT_TO_GOT) { |
| elfRelocType = Elf64_Rela.R_X86_64_PC32; |
| } else if (relocType == RelocType.EXTERNAL_GOT_TO_PLT) { |
| elfRelocType = Elf64_Rela.R_X86_64_64; |
| } else { |
| assert false : "Unhandled relocation type: " + relocType; |
| } |
| break; |
| |
| default: |
| System.out.println("Relocation Type mapping: Unhandled architecture: " |
| + ElfTargetInfo.getElfArch()); |
| } |
| return elfRelocType; |
| } |
| } |